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Appl Opt. 2009 Mar 10;48(8):1583-90.

Optimization of sideband modulation in optical-heterodyne-downmixed electro-optic sensing.

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  • 1Center for Electromagnetic Wave, Division of Physical Metrology, Korea Research Institute of Standardsand Science (KRISS), 1 Doryong-dong, Yusong-gu, Daejeon 305-340, South Korea.


Enhancements of the modulation depth in an electro-optic sensing application, through optimization of the modulation sidebands in both an electro-optic modulator and a microcavity electro-optic probe, have been investigated. The principles and methods of optimizing the operational bias points for the devices are described from the point of view of both an electro-optic modulator and probe, and their different optimum characteristics for signal-modulation depth, due to their huge scale gap, are presented. We use an optical-heterodyne receiver employing a fast modulator along with the electro-optic sensing technique to achieve high-frequency microwave electric field mapping. The practical limitations to sensitivity enhancement, solutions for compensating distortion, and combined optimization conditions for both electro-optic modulation and sensing are presented by exploring the evolution of field-mapping distributions.

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